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He showed it was impossible to determine both the exact position in speed of electrons as they moved around an atom. The idea that electrons cannot be pinpointed, but exist within a range of possible locations gave rise to the current quantum model of the atom. A fascinating theory, with a whole new set of complexities, whose implications have yet to be fully grasp.

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He expanded on Rutherford’s nuclear model
Drawing on earlier work by Max Planck and Albert Einstein, he stipulated that electrons orbit the nucleus, at fixed energies and distances. Able to jump from one level to another, but not to exist in the space between. Bohr’s planetary model took center stage, but soon it to encountered some complications. Experiments had shown that rather than simply being discreet particles electrons simultaneously behave for like waves not being confined to a particular point in space.

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While studying the effects of x-rays on gases, Rutherford decided to investigate atoms more closely by shooting small positively charged alpha particles at a sheet of gold foil. Rutherford concluded that atoms consisted largely of empty space with just a few electrons, while most of the mass was concentrated in the center, which he termed the nucleus. The alpha particles pass through the gaps, but bounce back from the dense positively charged nucleus.

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He showed atoms as uniformly, packed spheres of positive matter filled with negative charged electrons. Thompson won a Nobel prize in 1906 for his electron discovery.

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Dalton showed that common substances always broke down into the same elements in the same proportions. He suspected they were combinations of atoms of different elements,each of a particular size and mass that could neither be created nor destroyed.

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This is due next class meeting, if not completed this period!

Instructions on how to turn in are below.

Video: https://www.youtube.com/watch?v=xazQRcSCRaY&pp=ygUVdGVkIGVkIGF0b21pYyB0aGVvcnkg

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1. Click arrow under your profile pic.

2. Click ADD MEMBERS.

3. ADD my email. Give me CAN ADMINISTER access.

4. Go BACK and go to CHANGE PRIVACY.

5. Click PUBLIC.

6. Make it so visitors can view.

7. Go BACK and click COPY LINK TO CLIPBOARD.

8. Submit that link on Google Classroom.